#pragma warning(disable:4996)
#pragma warning(disable:6031)

#include <iostream>
#include <string>
using namespace std;

class A
{
public:
	A(int a = 10, int b = 20)
		:_a(a)
		,_b(b)
	{

	}
private:
	int _a;
	int _b;
};

int main()
{
	//string a;
	//getline(cin, a, ']');
	//cout << a << endl;
	A a;
	return 0;
}